package string;

/**
 * StringBuilder的演示
 */
public class StringSringBuilderDemo {
    public static void main(String[] args) {
        /*
        StringBuilder builder1=new StringBuilder();//空字符串
        StringBuilder builder2=new StringBuilder("abc");

        //String和StringBuilder互转:
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);//abc串
        String str2=builder3.toString();
         */

        String str="好好学习JAVA";
        //复制str的内容打牌builder中---好好学习Java
        StringBuilder builder=new StringBuilder(str);

        //append():追加内容--在末尾追加
        builder.append(",为了找个好工作");
        System.out.println(builder);//好好学习Java，为了好好工作

        //replace():替换部分内容（含头不含尾）
        builder.replace(9,16,"就是为了改变是世界");
        System.out.println(builder);//好好学习Java，就是为了改变是世界

        //delete():删除部分内容(含头不含尾)
        builder.delete(0,8);//删除下标0到7的
        System.out.println(builder);

        //insert():插入内容
        builder.insert(0,"活着");
        System.out.println(builder);
    }
}
